Sensitivity of stratospheric composition to oxygen absorption of solar radiation (175–210 nm) |
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| Authors: | R Toumi S Bekki |
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| Institution: | (1) Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Lensfield Rd, CB2 1EW Cambridge, U.K. |
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| Abstract: | We have used a two dimensional radiative-chemical-transport model of the stratosphere to investigate the sensitivity of trace gas distributions to absorption of oxygen in the wavelength region 175–210 nm. Two different formulations for the Herzberg continuum absorption cross sections are used. The calculated transmission of ultra-violet light in the stratosphere is lower and higher than observed, depending on the choice of absorption cross section. For the higher transmission O3, ClO, and HO2 are found to be significantly increased in the lower stratosphere. Calculated O3 in the upper stratosphere, chlorofluorocarbons, N2O and odd-nitrogen are lower. The photolysis of oxygen is considerably faster at high latitudes implying that the photochemical recovery of depleted polar ozone is faster than currently assumed. |
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| Keywords: | Ozone Herzberg continuum transmission |
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